Dattaro Conversion:

This modification custom-fits the instrument for players with smaller than average hands.                                                        

Tuning Bell Conversion:

This modification allows your instrument to vibrate more freely, giving it a more "live" sound. 

Maximum Response Conversion:

This modification provides silimar benefits as the Tuning Bell Conversion at a lesser cost.

Reverse Leadpipe Conversion:

This is modification gives the horn a more open feel (more free blowing).   In some cases this may also improve the response of the instrument as well.

Amado Water Key:

This is a modification offered by many manufacturers .